export declare function isObject(v: any): boolean;
export declare function isFunction(v: any): v is Function;
export declare function isString(v: any): v is string;
export declare function isDate(v: any): v is Date;
export declare function isBoolean(v: any): v is boolean;
export declare function isNumber(v: any): v is number;
export declare function isArray(v: any): v is Array<any>;
export declare function isUndefined(v: any): boolean;